RVA Car Stock

Does anyone know how good the car stocks are with a built in RVA? Which companies do you recommend? Do you know where I can get one? Haven't found much info on these stocks and the seem very hard to find.
I am building up a BT-4 SIR and want it to be reliable and as accurate a possible. The only way to have it this way is to polish the internals, install a RVA, and install a PPS 98 regulator. By having the Car stock with RVA I get the looks and function in one.

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